Sony ST-S333ESXII (1987)
A high-end FM/AM tuner from Sony's ES series, released in 1987 with digital tuning and noise reduction technologies.
Overview
The Sony ST-S333ESXII is an FM/AM tuner released in 1987 as part of Sony's high-fidelity ES (Elevated Standard) line. It was designed for audiophiles who wanted precise reception and low distortion. It has 20 preset memories, multiple tuning modes, and a set of proprietary signal-processing technologies aimed at FM reception and stereo decoding. An FM feeder antenna comes with it. The build uses mechanical isolation to reduce acoustic interference.
Specifications
| Practical sensitivity | 0.9 μV/10.3 dBf |
| Harmonic distortion factor (1 kHz, wide) | mono:0.004% stereo:0.0075% |
| Effective selectivity | wide:65dB(400kHz) narrow:65dB(300kHz) |
| Frequency response (1 kHz, stereo) | 15 Hz to 15 kHz + 0.2-0.5 dB |
| Spurious interference ratio | 120 dB or more |
| Signal-to-noise ratio | mono:100dB stereo:92dB |
| Separation (1 kHz) | 65dB |
| Power consumption | 16W |
| External dimensions | Width 470x Height 86x Depth 345 mm |
| Weight | 5.2kg |
| Attachment | FM feeder antenna |
Design
The ST-S333ESXII uses analog sense tuning via a physical dial, with manual, auto, and preset scan modes. It has 20 station presets and a program memory function for timer-based listening across four stations. A microcomputer manages operations and powers down after approximately 10 seconds of inactivity. The tuner uses a direct comparator with a PLL IC handling frequencies up to 220 MHz, with a 100 kHz comparison frequency. The SST (Super Sound Tracing) circuit divides the 76-90 MHz range into four bands to reduce front-end distortion. WOIS, WODD, and WODSD systems optimize the IF waveform, the detection, and the digital stereo decoding. The ES substrate uses selective resist material, and an ES filter deals with transformer winding characteristics. An active MPX filter replaces the traditional LC filter. The transformer and chassis are mechanically floated using materials with differing acoustic impedance.
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